Acting or being like or similar to a man named Quan! Quan being a cool yet righteous fellow of the men we know today. Yet sometimes the word can be used insultingly which would alter its meaning to a scared and wimpy little bitch of a man similar to that fucking ASS HOLE MOE!

Gent 1: hey that guy over there is about to dive in the sun while praying!
Gent 2: wow! He's so QUANISH!
Gent 2: TOTALLY.